We're trying to check for and report on pages which are predominantly black or gray, using Select page by gray surface. We're getting very few legitimate results, and a huge number of false positives. This appears to be because it checks only by non-gray objects, and not by gray objects themselves. So for example, if we're checking for pages which have non-gray surfaces less than 50% of total page area, it will flag pages that have 15% non-gray coverage and 70% gray coverage (good), but also pages that have 15% non-gray coverage and 0% gray coverage (bad).

Is there a way to directly check for and report on pages which have X% coverage of black/gray, regardless of percent of non-gray coverage?
Thanks in advance,
Joe